Multiples of 3 and 5
Problem: Find the sum of all the multiples of 3 or 5 below 1000. Solution:  1 2 3 4 5  sum  =  0   for  i in  range ( 1000 ):     if  (i %  3  ==  0  or  i %  5  ==  0 ):         sum  =  sum  +  i  print ( sum )    Note: This problem was taken from Project Euler (www.projecteuler.net).